I am a 21-year-old male looking to completely overhaul my lifestyle and regain control of my health. Over the last few years, heavy smoking, drinking, and weed consumption have taken a severe toll on my body and mind. I am fully committed to eliminating these habits and want to focus on two major requirements: 1. Physical Restoration: I want to reverse my low testosterone levels and rebuild my physique. My goal is to return to the muscular, athletic, and toned shape I had three years ago through dedicated strength training and nutrition. 2. Cognitive Clarity: I am experiencing severe brain fog and want to optimize my mental focus, memory, and cognitive sharpness. Could you please guide me on a structured, step-by-step roadmap covering medical checkups, training routines, and neuro-protective habits to help me successfully navigate this lifestyle transition? Thank you